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layer 3
An '''IP''' ("Internet Protocol") '''address''' is a unique identification number used by networked electronic devices. Each device has a unique IP address (or is behind a [[Network address translation|NAT]] router which does) on the Internet, which is used much like a mailing address. All communications sent to a specific device must list that device's IP address, and all communications from that device must include its source address.
An '''IP''' ("Internet Protocol") '''address''' is a unique identification number used by networked electronic devices. Each device has a unique IP address (or is behind a [[Network address translation|NAT]] router which does) on the Internet, which is used much like a mailing address. All communications sent to a specific device must list that device's IP address, and all communications from that device must include its source address. The IP address is used in networking on layer 3 of the [[OSI model]].
==Static vs dynamic==
==Static vs dynamic==